servlet的应用 ServletTest1 例子

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package test;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class CounterServlet extends HttpServlet{

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

//让客户端的汉字转为gbk形式

resp.setCharacterEncoding("gbk");

//得到相应的PintWriter已返回文本给客户端

PrintWriter out=resp.getWriter();

ServletContext context=getServletContext();

Integer count=(Integer) context.getAttribute("count");

if (count==null){

count=new Integer(0);

context.setAttribute("count", count);

}

out.println("<html>");

out.println("<head><title>WebCounter</title></head>");

out.println("<body bgcolor=/"#ffffff/">");

out.println("<p> The current COUNT is :"+count+ "</p>");

out.println("</body></html>");

count=new Integer(count.intValue()+1);

context.setAttribute("count", count);

}

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

// TODO Auto-generated method stub

super.doPost(req, resp);

}

public void destroy() {

// TODO Auto-generated method stub

super.destroy();

}

public void init() throws ServletException {

// TODO Auto-generated method stub

super.init();

}